1969 rear control arms - Chevelle Tech
Brakes, Suspension & Steering Conversion questions & more.

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post #1 of 10 (permalink) Old Apr 13th, 19, 7:09 PM Thread Starter
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1969 rear control arms

I just picked up set boxed lowers and uppers for that came out of 1969 Chevrolet. I know I can use the losers with sway bar, but the uppers can they be used with the 69 12 bolt I just got too. Or will I have to user the uppers with modification from my 1967 as I read they are longer or shorter not sure which car currently has the 10 bolt rear
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post #2 of 10 (permalink) Old Apr 13th, 19, 8:05 PM
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Re: 1969 rear control arms

The 1969 model year factory Rear Upper Control Arms for the 12 Bolt Rear End are slightly different from the Arms used with the '69's 10 Bolt. The 12 Bolt's Arms have a Reinforcement Tab on the Driver's Side Arm (the 10 Bolt versions do not have the reinforcement). The reinforcement was used because the Driver's Side Arms were cut down (radiused) to fit the 12 Bolt's upper ears.

The '68 through '72 Upper Control Arms were 10.25 inches. The '64 through '67 Arms were 12.75 inches.

Be aware that the width of the '69's 12 Bolt is different than the 67's...

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post #3 of 10 (permalink) Old Apr 13th, 19, 8:59 PM Thread Starter
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So to install the 12 bolt in my 1967 do I use my 67 10 bolt upper control arms with drivers side modified or use the 69 10 bolt upper control arms with drivers side modified, also is their any benefit to having the uppers boxed?
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post #4 of 10 (permalink) Old Apr 13th, 19, 10:13 PM
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Re: 1969 rear control arms



Your '67 Chevelle should retain the '67 Upper Control Arms with the '69 12 Bolt.

Test fit he '67 uppers on the 12 bolt prior to doing any hacking on them.

I would invest in a nice set of aftermarket uppers before I'd pay to have them boxed.

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post #5 of 10 (permalink) Old Apr 14th, 19, 9:06 AM Thread Starter
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So safe to say I can sand install bushings and paint the lowers, for the uppers is UMI safe choice? rest of suspension has been changed Bilsteins factory springs all body bushings and front bushings as well, also as the lowers are boxed would a rear sway bar help, have 1.25 Seay bar in front
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post #6 of 10 (permalink) Old Apr 14th, 19, 11:01 AM
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Re: 1969 rear control arms

1964 through 1967 used a longer upper control arm Bushing Hole Spacing Rear Control Arms Center to center bushing hole dimension for 1968 thru 1972 rear upper control arms is 10 1/4 inches.

Center to center bushing hole dimension for 1964 thru 1967 rear upper control arms is 12 3/4 inches.

https://www.lever-family-racing.com/...hole-dimension

Box Rear Upper Control Arms

https://www.lever-family-racing.com/...ox-rear-uppers

GM DOES NOT RECOMMEND the upper arms to be boxed. I only do it becuase people insist on paying me to do it.

12 Bolt.

https://www.lever-family-racing.com/...olt-difference







Box Rear Upper Control Arms

https://www.lever-family-racing.com/...ox-rear-uppers



Create 12 Bolt Control Arms

https://www.lever-family-racing.com/...e-12-bolt-arms

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Glenn R. Lever
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post #7 of 10 (permalink) Old Apr 14th, 19, 2:00 PM
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Re: 1969 rear control arms

Quote:
Originally Posted by Bradco View Post
So safe to say I can sand install bushings and paint the lowers, for the uppers is UMI safe choice? rest of suspension has been changed Bilsteins factory springs all body bushings and front bushings as well, also as the lowers are boxed would a rear sway bar help, have 1.25 Seay bar in front
The factory Rear Upper Control Arms should be fine unless you're doing some serious road racing and have gobs of horsepower.

A rear Sway Bar would be a great addition.

I like UMI, but the choice is yours.

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post #8 of 10 (permalink) Old Apr 15th, 19, 10:33 AM
 
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Re: 1969 rear control arms

1964-1967 arms are 12-15/16 on center.

1968-1972 arms are 10-1/4 on center.

The arms match the year of car.

Our upper arm, axle side, are clearanced and fit both 10 and 12 bolt. The material is thick enough to not require the reinforcement patch.

As Glen mentions, a little bit of flex up there helps. Our arms are pretty stout so if flex concerns you (i.e. you want some) you can use a Roto-Joint upper. The poly ones work great for general street and performance use.

Thanks guys for mentioning UMI.

ramey

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post #9 of 10 (permalink) Old Apr 16th, 19, 10:47 AM
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Re: 1969 rear control arms

My advice to you is use Moog rubber bushing, stock arms, box the lower arms and add a sway bar. I twill not handle like the same car.

Glenn R. Lever
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post #10 of 10 (permalink) Old Apr 16th, 19, 1:06 PM
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Wow! A lot of good information here.
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